507 lines
13 KiB
C++
507 lines
13 KiB
C++
/////////////////////////////////////////////////////////////////////////////
|
|
// Name: dragimag.cpp
|
|
// Purpose: wxDragImage sample
|
|
// Author: Julian Smart
|
|
// Modified by:
|
|
// Created: 28/2/2000
|
|
// Copyright: (c) Julian Smart
|
|
// Licence: wxWindows licence
|
|
/////////////////////////////////////////////////////////////////////////////
|
|
|
|
// For compilers that support precompilation, includes "wx/wx.h".
|
|
#include "wx/wxprec.h"
|
|
|
|
#ifdef __BORLANDC__
|
|
#pragma hdrstop
|
|
#endif
|
|
|
|
#ifndef WX_PRECOMP
|
|
#include "wx/wx.h"
|
|
#endif
|
|
|
|
#include "wx/image.h"
|
|
|
|
// Under Windows, change this to 1
|
|
// to use wxGenericDragImage
|
|
|
|
#define wxUSE_GENERIC_DRAGIMAGE 1
|
|
|
|
#if wxUSE_GENERIC_DRAGIMAGE
|
|
#include "wx/generic/dragimgg.h"
|
|
#define wxDragImage wxGenericDragImage
|
|
#else
|
|
#include "wx/dragimag.h"
|
|
#endif
|
|
|
|
#include "dragimag.h"
|
|
|
|
#ifndef wxHAS_IMAGES_IN_RESOURCES
|
|
#include "../sample.xpm"
|
|
#include "dragicon.xpm"
|
|
#endif
|
|
|
|
// main program
|
|
|
|
IMPLEMENT_APP(MyApp)
|
|
|
|
// MyCanvas
|
|
|
|
IMPLEMENT_CLASS(MyCanvas, wxScrolledWindow)
|
|
|
|
wxBEGIN_EVENT_TABLE(MyCanvas, wxScrolledWindow)
|
|
EVT_PAINT(MyCanvas::OnPaint)
|
|
EVT_ERASE_BACKGROUND(MyCanvas::OnEraseBackground)
|
|
EVT_MOUSE_EVENTS(MyCanvas::OnMouseEvent)
|
|
wxEND_EVENT_TABLE()
|
|
|
|
MyCanvas::MyCanvas( wxWindow *parent, wxWindowID id,
|
|
const wxPoint &pos, const wxSize &size )
|
|
: wxScrolledWindow( parent, id, pos, size, wxSUNKEN_BORDER )
|
|
{
|
|
SetBackgroundColour(* wxWHITE);
|
|
|
|
SetCursor(wxCursor(wxCURSOR_ARROW));
|
|
|
|
m_dragMode = TEST_DRAG_NONE;
|
|
m_draggedShape = (DragShape*) NULL;
|
|
m_dragImage = (wxDragImage*) NULL;
|
|
m_currentlyHighlighted = (DragShape*) NULL;
|
|
}
|
|
|
|
MyCanvas::~MyCanvas()
|
|
{
|
|
ClearShapes();
|
|
|
|
if (m_dragImage)
|
|
delete m_dragImage;
|
|
}
|
|
|
|
void MyCanvas::OnPaint( wxPaintEvent &WXUNUSED(event) )
|
|
{
|
|
wxPaintDC dc( this );
|
|
PrepareDC( dc );
|
|
|
|
DrawShapes(dc);
|
|
}
|
|
|
|
void MyCanvas::OnEraseBackground(wxEraseEvent& event)
|
|
{
|
|
if (wxGetApp().GetBackgroundBitmap().IsOk())
|
|
{
|
|
wxSize sz = GetClientSize();
|
|
wxRect rect(0, 0, sz.x, sz.y);
|
|
|
|
if (event.GetDC())
|
|
{
|
|
wxGetApp().TileBitmap(rect, *(event.GetDC()), wxGetApp().GetBackgroundBitmap());
|
|
}
|
|
else
|
|
{
|
|
wxClientDC dc(this);
|
|
wxGetApp().TileBitmap(rect, dc, wxGetApp().GetBackgroundBitmap());
|
|
}
|
|
}
|
|
else
|
|
event.Skip(); // The official way of doing it
|
|
}
|
|
|
|
void MyCanvas::OnMouseEvent(wxMouseEvent& event)
|
|
{
|
|
if (event.LeftDown())
|
|
{
|
|
DragShape* shape = FindShape(event.GetPosition());
|
|
if (shape)
|
|
{
|
|
// We tentatively start dragging, but wait for
|
|
// mouse movement before dragging properly.
|
|
|
|
m_dragMode = TEST_DRAG_START;
|
|
m_dragStartPos = event.GetPosition();
|
|
m_draggedShape = shape;
|
|
}
|
|
}
|
|
else if (event.LeftUp() && m_dragMode != TEST_DRAG_NONE)
|
|
{
|
|
// Finish dragging
|
|
|
|
m_dragMode = TEST_DRAG_NONE;
|
|
|
|
if (!m_draggedShape || !m_dragImage)
|
|
return;
|
|
|
|
m_draggedShape->SetPosition(m_draggedShape->GetPosition()
|
|
+ event.GetPosition() - m_dragStartPos);
|
|
|
|
m_dragImage->Hide();
|
|
m_dragImage->EndDrag();
|
|
wxDELETE(m_dragImage);
|
|
|
|
m_draggedShape->SetShow(true);
|
|
|
|
m_currentlyHighlighted = (DragShape*) NULL;
|
|
|
|
m_draggedShape = (DragShape*) NULL;
|
|
|
|
Refresh(true);
|
|
}
|
|
else if (event.Dragging() && m_dragMode != TEST_DRAG_NONE)
|
|
{
|
|
if (m_dragMode == TEST_DRAG_START)
|
|
{
|
|
// We will start dragging if we've moved beyond a couple of pixels
|
|
|
|
int tolerance = 2;
|
|
int dx = abs(event.GetPosition().x - m_dragStartPos.x);
|
|
int dy = abs(event.GetPosition().y - m_dragStartPos.y);
|
|
if (dx <= tolerance && dy <= tolerance)
|
|
return;
|
|
|
|
// Start the drag.
|
|
m_dragMode = TEST_DRAG_DRAGGING;
|
|
|
|
if (m_dragImage)
|
|
delete m_dragImage;
|
|
|
|
// Erase the dragged shape from the canvas
|
|
m_draggedShape->SetShow(false);
|
|
|
|
// redraw immediately
|
|
Refresh(true);
|
|
Update();
|
|
|
|
switch (m_draggedShape->GetDragMethod())
|
|
{
|
|
case SHAPE_DRAG_BITMAP:
|
|
{
|
|
m_dragImage = new MyDragImage(this, m_draggedShape->GetBitmap(), wxCursor(wxCURSOR_HAND));
|
|
break;
|
|
}
|
|
case SHAPE_DRAG_TEXT:
|
|
{
|
|
m_dragImage = new MyDragImage(this, wxString(wxT("Dragging some test text")), wxCursor(wxCURSOR_HAND));
|
|
break;
|
|
}
|
|
case SHAPE_DRAG_ICON:
|
|
{
|
|
m_dragImage = new MyDragImage(this, wxICON(dragicon), wxCursor(wxCURSOR_HAND));
|
|
break;
|
|
}
|
|
}
|
|
|
|
bool fullScreen = wxGetApp().GetUseScreen();
|
|
|
|
// The offset between the top-left of the shape image and the current shape position
|
|
wxPoint beginDragHotSpot = m_dragStartPos - m_draggedShape->GetPosition();
|
|
|
|
// Now we do this inside the implementation: always assume
|
|
// coordinates relative to the capture window (client coordinates)
|
|
|
|
//if (fullScreen)
|
|
// beginDragHotSpot -= ClientToScreen(wxPoint(0, 0));
|
|
|
|
if (!m_dragImage->BeginDrag(beginDragHotSpot, this, fullScreen))
|
|
{
|
|
wxDELETE(m_dragImage);
|
|
m_dragMode = TEST_DRAG_NONE;
|
|
|
|
} else
|
|
{
|
|
m_dragImage->Move(event.GetPosition());
|
|
m_dragImage->Show();
|
|
}
|
|
}
|
|
else if (m_dragMode == TEST_DRAG_DRAGGING)
|
|
{
|
|
// We're currently dragging. See if we're over another shape.
|
|
DragShape* onShape = FindShape(event.GetPosition());
|
|
|
|
bool mustUnhighlightOld = false;
|
|
bool mustHighlightNew = false;
|
|
|
|
if (m_currentlyHighlighted)
|
|
{
|
|
if ((onShape == (DragShape*) NULL) || (m_currentlyHighlighted != onShape))
|
|
mustUnhighlightOld = true;
|
|
}
|
|
|
|
if (onShape && (onShape != m_currentlyHighlighted) && onShape->IsShown())
|
|
mustHighlightNew = true;
|
|
|
|
if (mustUnhighlightOld || mustHighlightNew)
|
|
m_dragImage->Hide();
|
|
|
|
// Now with the drag image switched off, we can change the window contents.
|
|
if (mustUnhighlightOld)
|
|
m_currentlyHighlighted = (DragShape*) NULL;
|
|
|
|
if (mustHighlightNew)
|
|
m_currentlyHighlighted = onShape;
|
|
|
|
if (mustUnhighlightOld || mustHighlightNew)
|
|
{
|
|
Refresh(mustUnhighlightOld);
|
|
Update();
|
|
}
|
|
|
|
// Move and show the image again
|
|
m_dragImage->Move(event.GetPosition());
|
|
|
|
if (mustUnhighlightOld || mustHighlightNew)
|
|
m_dragImage->Show();
|
|
}
|
|
}
|
|
}
|
|
|
|
void MyCanvas::DrawShapes(wxDC& dc)
|
|
{
|
|
wxList::compatibility_iterator node = m_displayList.GetFirst();
|
|
while (node)
|
|
{
|
|
DragShape* shape = (DragShape*) node->GetData();
|
|
if (shape->IsShown() && m_draggedShape != shape)
|
|
{
|
|
shape->Draw(dc, (m_currentlyHighlighted == shape));
|
|
}
|
|
node = node->GetNext();
|
|
}
|
|
}
|
|
|
|
void MyCanvas::EraseShape(DragShape* shape, wxDC& dc)
|
|
{
|
|
wxSize sz = GetClientSize();
|
|
wxRect rect(0, 0, sz.x, sz.y);
|
|
|
|
wxRect rect2(shape->GetRect());
|
|
dc.SetClippingRegion(rect2.x, rect2.y, rect2.width, rect2.height);
|
|
|
|
wxGetApp().TileBitmap(rect, dc, wxGetApp().GetBackgroundBitmap());
|
|
|
|
dc.DestroyClippingRegion();
|
|
}
|
|
|
|
void MyCanvas::ClearShapes()
|
|
{
|
|
wxList::compatibility_iterator node = m_displayList.GetFirst();
|
|
while (node)
|
|
{
|
|
DragShape* shape = (DragShape*) node->GetData();
|
|
delete shape;
|
|
node = node->GetNext();
|
|
}
|
|
m_displayList.Clear();
|
|
}
|
|
|
|
DragShape* MyCanvas::FindShape(const wxPoint& pt) const
|
|
{
|
|
wxList::compatibility_iterator node = m_displayList.GetFirst();
|
|
while (node)
|
|
{
|
|
DragShape* shape = (DragShape*) node->GetData();
|
|
if (shape->HitTest(pt))
|
|
return shape;
|
|
node = node->GetNext();
|
|
}
|
|
return (DragShape*) NULL;
|
|
}
|
|
|
|
// MyFrame
|
|
IMPLEMENT_DYNAMIC_CLASS( MyFrame, wxFrame )
|
|
|
|
wxBEGIN_EVENT_TABLE(MyFrame,wxFrame)
|
|
EVT_MENU (wxID_ABOUT, MyFrame::OnAbout)
|
|
EVT_MENU (wxID_EXIT, MyFrame::OnQuit)
|
|
wxEND_EVENT_TABLE()
|
|
|
|
MyFrame::MyFrame()
|
|
: wxFrame( (wxFrame *)NULL, wxID_ANY, wxT("wxDragImage sample"),
|
|
wxPoint(20,20), wxSize(470,360) )
|
|
{
|
|
wxMenu *file_menu = new wxMenu();
|
|
file_menu->Append( wxID_ABOUT, wxT("&About"));
|
|
file_menu->AppendCheckItem( TEST_USE_SCREEN, wxT("&Use whole screen for dragging"), wxT("Use whole screen"));
|
|
file_menu->Append( wxID_EXIT, wxT("E&xit"));
|
|
|
|
wxMenuBar *menu_bar = new wxMenuBar();
|
|
menu_bar->Append(file_menu, wxT("&File"));
|
|
|
|
SetIcon(wxICON(sample));
|
|
SetMenuBar( menu_bar );
|
|
|
|
#if wxUSE_STATUSBAR
|
|
CreateStatusBar(2);
|
|
int widths[] = { -1, 100 };
|
|
SetStatusWidths( 2, widths );
|
|
#endif // wxUSE_STATUSBAR
|
|
|
|
m_canvas = new MyCanvas( this, wxID_ANY, wxPoint(0,0), wxSize(10,10) );
|
|
}
|
|
|
|
void MyFrame::OnQuit( wxCommandEvent &WXUNUSED(event) )
|
|
{
|
|
Close( true );
|
|
}
|
|
|
|
void MyFrame::OnAbout( wxCommandEvent &WXUNUSED(event) )
|
|
{
|
|
(void)wxMessageBox( wxT("wxDragImage demo\n")
|
|
wxT("Julian Smart (c) 2000"),
|
|
wxT("About wxDragImage Demo"),
|
|
wxICON_INFORMATION | wxOK );
|
|
}
|
|
|
|
//-----------------------------------------------------------------------------
|
|
// MyApp
|
|
//-----------------------------------------------------------------------------
|
|
|
|
wxBEGIN_EVENT_TABLE(MyApp, wxApp)
|
|
EVT_MENU(TEST_USE_SCREEN, MyApp::OnUseScreen)
|
|
wxEND_EVENT_TABLE()
|
|
|
|
MyApp::MyApp()
|
|
{
|
|
// Drag across whole screen
|
|
m_useScreen = false;
|
|
}
|
|
|
|
bool MyApp::OnInit()
|
|
{
|
|
if ( !wxApp::OnInit() )
|
|
return false;
|
|
|
|
#if wxUSE_LIBPNG
|
|
wxImage::AddHandler( new wxPNGHandler );
|
|
#endif
|
|
|
|
wxImage image;
|
|
if (image.LoadFile(wxT("backgrnd.png"), wxBITMAP_TYPE_PNG))
|
|
{
|
|
m_background = wxBitmap(image);
|
|
}
|
|
|
|
MyFrame *frame = new MyFrame();
|
|
|
|
wxString rootName(wxT("shape0"));
|
|
|
|
for (int i = 1; i < 4; i++)
|
|
{
|
|
/* For some reason under wxX11, the 2nd LoadFile in this loop fails, with
|
|
a BadMatch inside CreateFromImage (inside ConvertToBitmap). This happens even if you copy
|
|
the first file over the second file. */
|
|
if (image.LoadFile(wxString::Format("%s%d.png", rootName, i), wxBITMAP_TYPE_PNG))
|
|
{
|
|
DragShape* newShape = new DragShape(wxBitmap(image));
|
|
newShape->SetPosition(wxPoint(i*50, i*50));
|
|
|
|
if (i == 2)
|
|
newShape->SetDragMethod(SHAPE_DRAG_TEXT);
|
|
else if (i == 3)
|
|
newShape->SetDragMethod(SHAPE_DRAG_ICON);
|
|
else
|
|
newShape->SetDragMethod(SHAPE_DRAG_BITMAP);
|
|
frame->GetCanvas()->GetDisplayList().Append(newShape);
|
|
}
|
|
}
|
|
|
|
#if 0
|
|
// Under Motif or GTK, this demonstrates that
|
|
// wxScreenDC only gets the root window content.
|
|
// We need to be able to copy the overall content
|
|
// for full-screen dragging to work.
|
|
int w, h;
|
|
wxDisplaySize(& w, & h);
|
|
wxBitmap bitmap(w, h);
|
|
|
|
wxScreenDC dc;
|
|
wxMemoryDC memDC;
|
|
memDC.SelectObject(bitmap);
|
|
memDC.Blit(0, 0, w, h, & dc, 0, 0);
|
|
memDC.SelectObject(wxNullBitmap);
|
|
m_background = bitmap;
|
|
#endif
|
|
|
|
frame->Show( true );
|
|
|
|
return true;
|
|
}
|
|
|
|
int MyApp::OnExit()
|
|
{
|
|
return 0;
|
|
}
|
|
|
|
bool MyApp::TileBitmap(const wxRect& rect, wxDC& dc, wxBitmap& bitmap)
|
|
{
|
|
int w = bitmap.GetWidth();
|
|
int h = bitmap.GetHeight();
|
|
|
|
int i, j;
|
|
for (i = rect.x; i < rect.x + rect.width; i += w)
|
|
{
|
|
for (j = rect.y; j < rect.y + rect.height; j+= h)
|
|
dc.DrawBitmap(bitmap, i, j);
|
|
}
|
|
return true;
|
|
}
|
|
|
|
void MyApp::OnUseScreen(wxCommandEvent& WXUNUSED(event))
|
|
{
|
|
m_useScreen = !m_useScreen;
|
|
}
|
|
|
|
// DragShape
|
|
|
|
DragShape::DragShape(const wxBitmap& bitmap)
|
|
{
|
|
m_bitmap = bitmap;
|
|
m_pos.x = 0;
|
|
m_pos.y = 0;
|
|
m_dragMethod = SHAPE_DRAG_BITMAP;
|
|
m_show = true;
|
|
}
|
|
|
|
bool DragShape::HitTest(const wxPoint& pt) const
|
|
{
|
|
wxRect rect(GetRect());
|
|
return rect.Contains(pt.x, pt.y);
|
|
}
|
|
|
|
bool DragShape::Draw(wxDC& dc, bool highlight)
|
|
{
|
|
if (m_bitmap.IsOk())
|
|
{
|
|
wxMemoryDC memDC;
|
|
memDC.SelectObject(m_bitmap);
|
|
|
|
dc.Blit(m_pos.x, m_pos.y, m_bitmap.GetWidth(), m_bitmap.GetHeight(),
|
|
& memDC, 0, 0, wxCOPY, true);
|
|
|
|
if (highlight)
|
|
{
|
|
dc.SetPen(*wxWHITE_PEN);
|
|
dc.SetBrush(*wxTRANSPARENT_BRUSH);
|
|
dc.DrawRectangle(m_pos.x, m_pos.y, m_bitmap.GetWidth(), m_bitmap.GetHeight());
|
|
}
|
|
|
|
return true;
|
|
}
|
|
else
|
|
return false;
|
|
}
|
|
|
|
// MyDragImage
|
|
|
|
// On some platforms, notably Mac OS X with Core Graphics, we can't blit from
|
|
// a window, so we need to draw the background explicitly.
|
|
bool MyDragImage::UpdateBackingFromWindow(wxDC& WXUNUSED(windowDC), wxMemoryDC& destDC, const wxRect& WXUNUSED(sourceRect),
|
|
const wxRect& destRect) const
|
|
{
|
|
destDC.SetClippingRegion(destRect);
|
|
|
|
if (wxGetApp().GetBackgroundBitmap().IsOk())
|
|
wxGetApp().TileBitmap(destRect, destDC, wxGetApp().GetBackgroundBitmap());
|
|
|
|
m_canvas->DrawShapes(destDC);
|
|
return true;
|
|
}
|
|
|